I have in mind to buy an air pistol to
a) be able to practice pistol shooting for cheap.
b) be able to practice quietly (in forest or even in my own basement).
c) be able to hunt small game anymals (like squirrels and rabbits) at the same time as deer hunting without spooking deer.

I don't want a more powerful air rifle because of a handgun practice aspect of it and because it is not convenient to carry 2 rifles and I might need my hands free while walking.

Are air guns with 400-480 fps powerful enough to kill a rabbit / squirrel?